.absolute {
    position: absolute;   
}

.absolute_auto {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.absolute_center {
	position: absolute;
	left: 50%;
	transform: translate(-50%); 
}
.absolute_middle {
	position: absolute;
	top: 50%;
	transform: translateY(-50%);
}

.relative {
    position: relative;
}

.fixed {
    position: fixed;
}

.fixed_auto {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}